CN105334181B - The quick determination method of Irradiation On Peanut - Google Patents
The quick determination method of Irradiation On Peanut Download PDFInfo
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- CN105334181B CN105334181B CN201510695093.9A CN201510695093A CN105334181B CN 105334181 B CN105334181 B CN 105334181B CN 201510695093 A CN201510695093 A CN 201510695093A CN 105334181 B CN105334181 B CN 105334181B
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Abstract
The present invention provides a kind of quick determination method of irradiated food, it is to be based on THz wave spectral technology, the Terahertz wave spectrum of irradiation situation food known to collection, analyze the slope characteristics of its characteristic point line under characteristic frequency, the Terahertz wave spectrum of food to be measured is gathered under same experimental conditions, judges food to be measured whether by the ionization radiation irradiation of radioactive source generation according to the slope characteristics of its characteristic point line under features described above frequency.This method can be realized carries out quick, efficient, environmental-friendly discriminating to irradiated food, and important technical is provided so as to be used etc. for food safety monitoring, radioactive sources safety.
Description
Technical field
The present invention relates to field of food detection, specifically, is related to a kind of quick determination method of irradiated food.
Background technology
Ionising radiation caused by radioactive source contains huge energy and crushing lethality, therefore can be used for some foods
The working processes such as the anti-corrosions of product, insect prevention, sterilization.However, the food rich in lipid once Jing Guo ionising radiation irradiation (abbreviation
" ionizing radiation " or " irradiation ") processing, aliphatic acid contained therein, the particularly unrighted acid containing double bond easily occur
Fracture, the similar oxidation of its result, causes fatty acid decomposition, food quality declines, or even becomes sour, and seriously affects consumer's
Health.
For food whether the detection Jing Guo radiation treatment, conventional method be using isotope analysis, combined gas chromatography mass spectrometry
Analysis etc., not only analysis time is grown, but also uses a large amount of chemical reagent in the analysis process, and environment is polluted.
Terahertz wave spectrum is a part for electromagnetic spectrum, its wavelength is between infrared between microwave.The number of Terahertz wave spectrum
There are the diversified forms such as Time Domain Spectrum, spectrum of refractive index, absorption coefficient spectrum according to the form of expression, can be according to different experiment purpose or different
Application makes choice.Terahertz wave spectrum has certain response to the grease in material, this is to use Terahertz wave spectrum pair
Food makes the physics and chemistry basis quickly detected after predose and irradiation.Wherein, " non-irradiated " food refers to the food of predose, not
Handled by any ionizing radiation, be also known as food, the food of " without radiation treatment " of " not irradiated "；" irradiation " food is
Refer to the food after irradiation, have passed through ionizing radiation processing, be also known as food, the food of " (quilt) radiation treatment " of " (quilt) is irradiated "
Product.
The content of the invention
The present invention be directed to irradiated food detection problem, there is provided a kind of irradiated food based on THz wave spectral technology it is fast
Fast detection method, the purpose is to food, whether the irradiation of the ionising radiation produced by radioactive source is used for quickly detecting.
In order to achieve the object of the present invention, the quick determination method of a kind of irradiated food of the invention, comprises the steps of：
(1) Terahertz of food after predose food and irradiation is gathered under same experimental conditions using terahertz wave spectrometer
Spectral data；
(2) two characteristic frequencies are chosen using enumerative technique and obtains its Terahertz wave spectrum response, i.e., obtain irradiation respectively
Two characteristic points after preceding food and irradiation on the THz wave spectrogram of food.
(3) calculate on THz wave spectrogram link above-mentioned two characteristic point line slope, analysis predose food and
The property of food characteristic point line slope after irradiation, the whether radiation exposed slope decision threshold of food is determined according to the property of slope
Value；
(4) under same experimental conditions, the Terahertz wave spectrum of food to be measured is gathered, and calculates food Terahertz wave spectrum to be measured
The line slope of two characteristic points under above-mentioned two characteristic frequency；
(5) by compared with the slope decision threshold of step (3), being judged to whether food to be measured is illuminated.
In statistics, enumerative technique refers to the situation that is possible to included to the object studied, and one carries out with not leaking
Examine, therefrom find out satisfactory answer.In the present invention, enumerative technique refers to during characteristic frequency is found, for
All frequencies of Terahertz wave spectrum, one is tested with not leaking, and therefrom finding out can be by food after predose food and irradiation
The characteristic frequency being distinguish between.The selection principle of characteristic frequency is：Its terahertz is combined with two variables (frequency) enumerated every time
Hereby wave spectrogram, obtains its line slope characteristics, i.e. slope value (k).After slope value, which disclosure satisfy that, makes predose food and irradiation
When food reaches maximum correct decision rate, selected frequency, that is, characteristic frequency.
Foregoing method, utilizes the Terahertz wave spectrum of the food of terahertz wave spectrometer collection, including its various Data Representation
Form, such as absorption coefficient spectrum, Time Domain Spectrum, spectrum of refractive index etc., and in step (1) and (4) Terahertz wave spectrum Data Representation shape
Formula is consistent.
Foregoing method, food described in step (1)-(3) are congener with food to be measured described in step (4), (5)
Food, and the food that the irradiated food is the ionization radiation irradiation produced by radioactive source.
Preferably, heretofore described food is peanut.During using peanut as detection object, produced by terahertz wave spectrometer
Electromagnetic spectrum frequency range be preferably 0-4THz；Composed for Terahertz absorption coefficient, further preferred wave spectrum frequency is
0.50THz and 1.70THz, slope decision threshold are 880；For Terahertz spectrum of refractive index, further preferred wave spectrum frequency is
0.31THz and 1.75THz, slope decision threshold are 0.5424.
The work flow diagram whether quickly differentiated by irradiation to food using THz wave spectrometry is as shown in Figure 1.
The quick determination method of irradiated food provided by the invention is to be based on THz wave spectral technology, without being carried out to sample
Complicated pretreatment can directly gather the Terahertz wave spectrum of sample, therefore will not produce secondary pollution to environment；Institute of the present invention
The data processing method used is simple and practicable, can be achieved without professional meterological software；The data handling procedure of the present invention relates to
And variable number only has two, exploitation, development for follow-up tailored version instrument also have important references value.This method can be real
Quick, efficient, environmental-friendly discriminating is now carried out to irradiated food, so as to be used for food safety monitoring, radioactive sources safety
Aspect provides important technical.
Brief description of the drawings
Fig. 1 is whether the present invention passes through food using THz wave spectrometry the workflow that irradiation is quickly differentiated
Figure.
Fig. 2 be the embodiment of the present invention 1 in predose peanut and irradiation after peanut Terahertz absorption coefficient wave spectrogram and
Characteristic frequency, characteristic point and characteristic point line involved by above-mentioned sample.
Fig. 3 is Terahertz refractive index spectrogram and above-mentioned sample of the predose peanut with peanut after irradiation in the embodiment of the present invention 2
Characteristic frequency, characteristic point and characteristic point line involved by product.
Embodiment
Following embodiments are used to illustrate the present invention, but are not limited to the scope of the present invention.Unless otherwise specified, embodiment
In the conventional means that are well known to those skilled in the art of used technological means, raw materials used is commercial goods.
Terahertz absorption coefficient spectrum analysis and sample to be tested Fast nondestructive evaluation after 1 peanut predose of embodiment
Contain a large amount of lipids in peanut, if carrying out the processing such as sterilizing pesticide using irradiation, the chemistry knot of lipid can be destroyed
Structure, causes fatty acid chain fracture, edible quality to decline, the serious consequence such as adversely affects to consumer's health.
The present embodiment gathers Terahertz to peanut after predose peanut and irradiation using terahertz wave spectrometer and absorbs system respectively
Number modal data.The model and experiment parameter of used terahertz wave spectrometer are as follows.
Instrument model：ADVANTEST TAS7500SP terahertz wave spectrometers；
Sample mode：Attenuated total reflectance；
Frequency resolution：0.0076THz；
Spectral range：0THz~4THz；
Reference accumulative frequency：2048 times；
Sample accumulative frequency：2048 times；
Phase angle：0 degree.
First, THz wave modal data is gathered to the peanut of known irradiation situation using terahertz wave spectrometer.THz wave
The data representation of spectrum has the diversified forms such as Time Domain Spectrum, spectrum of refractive index, absorption coefficient spectrum, and the preferred Terahertz of the present embodiment absorbs
Coefficient modal data, as shown in Figure 2.
The Terahertz absorption coefficient spectrum of peanut after predose peanut is indicated in Fig. 2 and is irradiated.By studying Spectral Characteristic,
The characteristic frequency position composed for Terahertz absorption coefficient after peanut predose is found using enumerative technique, i.e. in Fig. 2 " feature is frequently
Rate 1 " and " characteristic frequency 2 ", frequency values are respectively 0.50THz, 1.70THz.
Two Terahertz absorption coefficients are found on spectrogram respectively and compose the response signal under above-mentioned two characteristic frequency, i.e.,
Characteristic point " A1 ", " A2 ", " B1 ", " B2 ".Link characteristic point " A1 ", " A2 ", that is, obtain predose peanut characteristic point line；Link
Characteristic point " B1 ", " B2 ", that is, peanut characteristic point line after being irradiated.Slope (the slope letter k of two lines is calculated respectively
Represent), kA1A2 predoses=957, kAfter B1B2 irradiation=14.Compare two line slope values and find that the line slope value of peanut is bright after irradiation
The aobvious line slope less than predose peanut.
To verify the accuracy of the above method, under same experimental conditions, separately after 7 groups of peanut sample predoses of collection too
Hertz wave spectrum.For absorption coefficient modal data, features described above frequency, i.e. response signal value under 0.50THz, 1.70THz are obtained.
Connect the characteristic point of sample respectively on spectrogram, calculate line slope, the results are shown in Table 1.Wherein, the calculation formula of slope is such as
Under：
Slope=(characteristic frequency response 2- characteristic frequencies response 1)/(characteristic frequency 2- characteristic frequencies 1)
The characteristic frequency response and slope of 1 peanut of table
As seen from Table 1, composed for Terahertz absorption coefficient, 7 groups of samples all meet the spy under peanut characteristic frequency after irradiation
The characteristics of sign selects the characteristic point line slope that line slope value is significantly less than under predose peanut characteristic frequency, illustrates that this method has
There is certain universality, can meet the needs of (examination) is quickly detected to Irradiation On Peanut.
From the slope value of table 1 as it can be seen that being composed for Terahertz absorption coefficient, 7 groups of verification samples, the characteristic point of predose sample
Line slope minimum value, maximum, sample mean, sample standard deviation are respectively 2267,3523,2831,375, sample after irradiation
Characteristic point line slope minimum value, maximum, sample mean, the sample standard deviation of product are respectively -12,31,11,14.According to
3 σ of statistics rules, predose peanut characteristic point line slope range are 2831 ± 375 × 3, i.e., 1707~3956, flower after irradiation
Raw characteristic point line slope range is 11 ± 14 × 3, i.e., -31~53.As it can be seen that the characteristic point of peanut and predose peanut after irradiation
Line slope range has obvious difference.Therefore, according to peanut after the slope lower limit 1707 of predose peanut and irradiation
The slope upper limit 53, takes the median of the two, you can sets slope decision threshold as 880, i.e., for sample to be tested, characteristic point line
When slope is more than 880, not irradiated peanut can be regarded as, when characteristic point line slope is less than 880, can regard as being illuminated
Peanut.
For further verification the above method universality, peanut sample total quantity is expanded to 84 parts, be divided into control group and
42 parts of irradiation group, i.e. control group peanut (predose peanut), 42 parts of irradiation group peanut (peanut after irradiation).Control group peanut without
Ionization radiation irradiation processing is crossed, irradiation group peanut is handled by ionization radiation irradiation.Respectively to irradiation group peanut, control group peanut
Terahertz absorption coefficient spectrum is gathered, each sample Terahertz absorption coefficient spectrum line slope under features described above frequency is calculated, carries out
Statistical analysis.The result shows that as stated above, the characteristic point line slope of verification control group peanut accounts for 84.6% more than 880,
The characteristic point line slope of verification irradiation group peanut accounts for 80.1% less than 880, that is, verifies that the accuracy of control group peanut is reachable
To 84.6%, the accuracy of verification irradiation group peanut can reach 80.1%, can meet quickly to detect Irradiation On Peanut (examination)
Demand.
The analysis of Terahertz spectrum of refractive index and sample to be tested Fast nondestructive evaluation after 2 peanut predose of embodiment
The present embodiment gathers Terahertz refractive index respectively using terahertz wave spectrometer to peanut after predose peanut and irradiation
Modal data.The model and experiment parameter of used terahertz wave spectrometer are as follows.
Instrument model：ADVANTEST TAS7500SP terahertz wave spectrometers；
Sample mode：Attenuated total reflectance；
Frequency resolution：0.0076THz；
Spectral range：0THz~4THz；
Reference accumulative frequency：2048 times；
Sample accumulative frequency：2048 times；
Phase angle：0 degree.
The preferred Terahertz spectrum of refractive index data of the present embodiment, as shown in Figure 3.
For spectrum of refractive index, the characteristic frequency 1 selected by enumerative technique, characteristic frequency 2 be respectively 0.31THz and
1.75THz.It can be seen from figure 3 that the line slope of predose sample Terahertz spectrum of refractive index at above-mentioned two characteristic frequency
(kA1A2 predoses) larger, and the line slope of irradiated sample Terahertz spectrum of refractive index at above-mentioned two characteristic frequency
(kAfter B1B2 irradiation) smaller.
To verify the accuracy of the above method, under same experimental conditions, separately after 9 groups of peanut sample predoses of collection too
Hertz wave spectrum.For spectrum of refractive index data, features described above frequency, i.e. response signal value under 0.31THz, 1.75THz are obtained.
The characteristic point of sample is connected on spectrogram respectively, calculates line slope, the results are shown in Table 2.Wherein, the calculation formula of slope is such as
Under：Slope=(characteristic frequency response 2- characteristic frequencies response 1)/(characteristic frequency 2- characteristic frequencies 1)
The characteristic frequency response and slope of 2 verification sample of table
As seen from Table 2, for Terahertz spectrum of refractive index, peanut is under characteristic frequency after 9 groups of verification samples all meet irradiation
Characteristic point line slope value it is smaller, and the characteristics of characteristic point line slope value of the predose peanut under characteristic frequency is larger,
Illustrate that this method has certain universality, can meet the needs of (examination) is quickly detected to Irradiation On Peanut.
From the slope value of table 2 as it can be seen that being directed to Terahertz spectrum of refractive index, 9 groups of verification samples, the characteristic point of predose sample connects
Line slope minimum value, maximum, sample mean, sample standard deviation are respectively 0.8929,1.3233,1.1227,0.1623, spoke
According to the characteristic point line slope minimum value of rear sample, maximum, sample mean, sample standard deviation be respectively -2.0488, -
0.1060、-1.4725、0.6405.According to 3 σ of statistics rules, predose peanut characteristic point line slope range for 1.1227 ±
0.1623 × 3, i.e., 0.6359~1.6096, peanut characteristic point line slope range is -1.4725 ± 0.6405 × 3 after irradiation,
I.e. -3.3939~0.4489.As it can be seen that the characteristic point line slope range of peanut and predose peanut is with obvious poor after irradiation
It is different.Therefore, according to the upper limit 0.4489 of peanut after the slope lower limit 0.6359 of predose peanut and irradiation, the centre of the two is taken
Value, you can set slope decision threshold as 0.5424, i.e.,, can when characteristic point line slope is more than 0.5424 for sample to be tested
Not irradiated peanut is regarded as, when characteristic point line slope is less than 0.5424, the peanut being illuminated can be regarded as.
For further verification the above method universality, peanut sample total quantity is expanded to 90 parts, be divided into control group and
Irradiation group, i.e. 45 parts of control group peanut (predose), 45 parts of irradiation group peanut (after irradiation).Control group peanut is without ionization spoke
Treatment with irradiation is penetrated, irradiation group peanut is handled by ionization radiation irradiation.Terahertz is gathered to irradiation group peanut, control group peanut respectively
Hereby spectrum of refractive index, calculates each sample Terahertz spectrum of refractive index line slope under features described above frequency, carries out statistical analysis.As a result
Show, as stated above, the characteristic point line slope of verification control group peanut accounts for 86.7% more than 0.5424, verifies irradiation group
The characteristic point line slope of peanut accounts for 82.2% less than 0.5424, that is, verifies that the accuracy of control group peanut can reach
86.7%, the accuracy of verification irradiation group peanut can reach 82.2%, can meet the needs of quickly being detected to Irradiation On Peanut.
Although above the present invention is described in detail with a general description of the specific embodiments,
On the basis of the present invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Cause
This, these modifications or improvements, belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
Claims (2)
1. a kind of quick determination method of Irradiation On Peanut, it is characterised in that comprise the steps of：
(1) the Terahertz wave spectrum of peanut after predose peanut and irradiation is gathered under same experimental conditions using terahertz wave spectrometer
Data；
(2) two characteristic frequencies are chosen using enumerative technique and obtains its Terahertz wave spectrum response, i.e., obtain predose flower respectively
Two characteristic points after raw and irradiation on the THz wave spectrogram of peanut；
(3) slope for linking above-mentioned two characteristic point line on THz wave spectrogram is calculated, analyzes predose peanut and irradiation
The property of peanut characteristic point line slope afterwards, the whether radiation exposed slope decision threshold of peanut is determined according to the property of slope；
(4) under same experimental conditions, the Terahertz wave spectrum of peanut to be measured is gathered, and calculates peanut Terahertz wave spectrum to be measured upper
State the line slope of two characteristic points under two characteristic frequencies；
(5) by compared with the slope decision threshold of step (3), so as to be judged to whether peanut to be measured is illuminated；
The Irradiation On Peanut is the peanut of the ionization radiation irradiation produced by radioactive source；
Using the Terahertz wave spectrum of the peanut of terahertz wave spectrometer collection, its data representation includes absorption coefficient and composes or reflect
Rate is composed；
Electromagnetic spectrum frequency range caused by terahertz wave spectrometer is 0-4THz；Composed for Terahertz absorption coefficient, the spy
Sign frequency is 0.50THz and 1.70THz, and slope decision threshold is 880；For Terahertz spectrum of refractive index, the characteristic frequency is
0.31THz and 1.75THz, slope decision threshold are 0.5424.
2. according to the method described in claim 1, it is characterized in that, in step (1) and (4) Terahertz wave spectrum Data Representation shape
Formula is consistent.
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